A Novel V-Band Relativistic Transit-Time Oscillator With High Power Handling Capacity

A novel V-band coaxial transit-time oscillator (TTO) with high power handling capacity is presented. The interaction region is designed to operate in TM₀₂ mode to increase power handling capacity of the device. By using a traveling wave output structure, the saturation time of the device is improved, and the maximum surface electric field is decreased. The output structure is also good for improving beam-wave interaction. To avoid mode competition, deep corrugation is applied to the slow wave structure, so the Rayleigh hypothesis is not satisfied. Hence the dispersion relation of the SWS in output structure is analyzed by mode matching method instead of Floquet harmonic expansion method. In numerical simulation, a 642MW microwave pulse at 60.0GHz is obtained with a diode voltage of 400kV and beam current of 5kA. The power conversion efficiency is about 32.1%.